<html>
<head>
<style>
	body {
	  height: 4000px;
	  margin: 0;
	}

	#outer {
	  margin: 200px;
	  height: 700px;
	  width: 300px;
	  transform: rotate(45deg);
	  -webkit-transform: rotate(45deg);
	  overflow: hidden;
	}

	#inner {
	  height: 700px;
	  background-image: radial-gradient(farthest-corner at center, blue, black);
	  background-size: 300px 300px;
	  background-position: 200px 200px;
	  background-color: lime;
	  background-repeat: no-repeat;
	  background-attachment: fixed;
	}
</style>
</head>
<body>
<div id="outer">
	<div id="inner">
	</div>
</div>
</body>
</html>
